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1 INTRODUCTION A polymer glass, like a glass in general, is a material out of equilibrium. As a result, the properties of a polymer glass are not fully determined by the current values of temperature and pressure, but also depend on the thermo-mechanical history the material has been subjected to since entering the glassy state.1, 2 Examples of thermal histories are constant rate cooling from melt and sub-Tg isothermal annealing, also known as physical aging.
In this communication, we propose a different approach for analyzing linear viscoelastic relaxation data that is more faithful to the underlying physics and naturally accommodates the thermorheological complexity that is observed in glass-forming polymers. Specifically, the linear viscoelastic behavior was evaluated for a diglycidyl ether of bisphenol-A epoxy cured with 4,4′-methylenedianaline with a glass transition temperature (Tg) of 101.5 °C.
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